false positive sera/plasma sources

Hello All,
I'm looking for comercial sources of HIV-false positive sera or plasma. It
needs to be false positive by immunoassay and not by NAT.
The reason I'm asking is I'm trouble shooting the false positives in the
assay my company produces, a flow cytometry kit for counting HIV infected
cells. So, I want to get a documented, consistent source of HIV false
positve blood product, that I can use as a standard. This should help me
tease out the nature(s) of my own false positives.
I've, so far, looked at Scantibodies and Zeptometrix, but I would have to
buy more than I really need from them and end up wasting most of it. Any
help is greatly appreciated.

Regards,
Adrian Rubio
Laboratory Manager
Theranostech, Inc.
Albuquerque, NM 87109
O:(505) 342-0224 X234
F:(505) 342-0225